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An audio plug connector includes a contact module, a plug, and a switch module. The contact module includes a shell, a first contact terminal and a second contact terminal both received in the shell. The plug disposed in the shell has a mating portion, a first contact portion and a second contact po

An audio plug connector includes a contact module, a plug, and a switch module. The contact module includes a shell, a first contact terminal and a second contact terminal both received in the shell. The plug disposed in the shell has a mating portion, a first contact portion and a second contact portion. The mating portion extends out of the shell. The first contact portion and the second contact portion are received in the shell and respectively contact the first contact terminal and the second contact terminal. The switch module includes a shaft and a switch terminal held in one end of the shaft. The end of the shaft holding the switch terminal is rotatably received in the shell. The switch terminal is selectively connected with the first contact terminal and the second contact terminal under the rotation of the shaft.

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What is claimed is: 1. An audio plug connector, comprising: a contact module having a shell, a first contact terminal and a second contact terminal both received in the shell; a plug disposed in the shell having a mating portion, a first contact portion and a second contact portion, the mating port

What is claimed is: 1. An audio plug connector, comprising: a contact module having a shell, a first contact terminal and a second contact terminal both received in the shell; a plug disposed in the shell having a mating portion, a first contact portion and a second contact portion, the mating portion extending out of the shell, the first contact portion and the second contact portion received in the shell and respectively contacting the first contact terminal and the second contact terminal; and a switch module having a shaft and a switch terminal held in one end of the shaft, the end of the shaft holding the switch terminal rotatably received in the shell, the switch terminal being selectively connected with the first contact terminal and the second contact terminal under the rotation of the shaft. 2. The audio plug connector as claimed in claim 1, wherein the end of the shaft rotatably received in the shell has a contact loop, the switch terminal has a contact piece fixedly attached on an outside of the contact loop. 3. The audio plug connector as claimed in claim 2, wherein the switch terminal has a substantially U-shaped clipping portion clipping in the contact loop, the clipping portion has a clipping piece and the contact piece superposed with and spaced from the clipping piece, the clipping piece is attached on an inner surface of the contact loop, the contact piece is attached on the outside of the contact loop. 4. The audio plug connector as claimed in claim 2, wherein the outside of the contact loop defines a fixing groove, the contact piece is fixed in the fixing groove of the contact loop. 5. The audio plug connector as claimed in claim 2, wherein the first contact terminal and the second contact terminal respectively have an arc-shaped first holding piece and an arc-shaped second holding piece, the first holding piece and the second holding piece are placed on the outside of the contact loop and spaced from each other, the switch terminal selectively contact the first holding piece and the second holding piece. 6. The audio plug connector as claimed in claim 5, wherein one side of the first holding piece and the second holding piece respectively extend outward to form a first connecting portion and a second connecting portion, free ends of the first connecting portion and the second connecting portion are respectively bent to form a first contact point and a second contact point, the first contact point and the second contact point are respectively connected with the first contact portion and the second contact portion of the plug. 7. The audio plug connector as claimed in claim 6, wherein the shell includes a first shell and a second shell engaged with the first shell, the first shell and the second shell respectively have a hemi-cylinder shaped first basic portion and a hemi-cylinder shaped second basic portion, a first protrusion and a second protrusion are respectively protruded from the inner surfaces of the first basic portion and the second basic portion, the first holding piece of the first contact terminal and the second holding piece of the second contact terminal are respectively supported by the first protrusion and the second protrusion, a plurality of first bumps and a plurality of second bumps are respectively protruded from the inner surfaces of the first basic portion and the second basic portion for respectively holding the first connecting portion of the first contact terminal and the second connecting portion of the second contact terminal therebetween. 8. The audio plug connector as claimed in claim 7, wherein the plug further includes a holding board with a plurality of first holding holes therein, the inner surfaces of the first basic portion and the second basic portion respectively extend to form a plurality of first rods and a plurality of second rods, each of the second rods defines a second holding hole therein, the first rod passes through the first holding hole of the holding board and is inserted into the second holding hole of the second rod. 9. The audio plug connector as claimed in claim 1, further comprising a plurality of arc-shaped positioning pieces disposed in one end of the shell, the middle of each of the positioning pieces is dented to form a retaining portion. 10. The audio plug connector as claimed in claim 9, wherein the shaft further includes a positioning loop, a plurality of positioning slots are formed in an outer surface of the positioning loop along an axis direction of the shaft, the positioning pieces surround the positioning loop and the retaining portions of the positioning pieces are received in the positioning slots of the positioning loop. 11. The audio plug connector as claimed in claim 1, wherein the shaft has a drive portion disposed opposite to the contact loop, a plurality of fixing pieces are protruded from an outer surface of the drive portion. 12. The audio plug connector as claimed in claim 11, further comprising a tail mated with the drive portion of the shaft, the fixing pieces fixed in an inner surface of the tail.